Engine governor



Patented Feb. 11, 1947 UNITED STATES. PATENT OFFICE ENGINE GOVERNOR Marion Mallory, Detroit, Mich. Original application March I, 1945, Serial No. 580,450. Divided and this application April 26, 1945, Serial No. 590,335

. 5 Claims. (01. 123-103) This invention relates to a governor for controlling the speed of an internal combustion engine, and more particularly to an engine speed governor which is actuated by changes in the intake passageway pressure.

sageway pressure which will effectively control the speed of the engine substantially free from surging. V

Thediawing is an elevation partly in section of my governor. l

The parts of my engine governor assembly are referenced as follows: intake passageway I having inlet opening 2 and outlet to the engine 3, governor valve 4 of the butterfly type, governor valve shaft 5,'tension spring 6 connected to arm I which is fixed on valve shaft 5, suction device 8, suction chamber 9, flexible diaphragm l0, rod l I connecting diaphragm with arm I, orifice l2 positioned opposite or in the same plane as throttle shaft 5, conduit l connecting orifice [2 with suction chamber 9, conduit 16 connected into conduit l5 and connecting suction chamber 9 with circumferential passageway I1 and T passageway l8 in distributor shaft l9 run 01f of the engine, valve housing fixed on shaft l9, piston valve body 2|, tension spring 22, internally threaded block 23 and adjusting screw 24 which can be turned to move block 23 to increase or decrease the ten sion of spring 22, by-pass groove 25 in valve body 2|, valve 26, air bleed orifice 28 and orifice 29 in distributor housing 30 through which the interior of the housing communicates with atmosphere, valve seat 3|.

This governor is a modification of that shown in my copending application Serial No. 466,961, filed November .5, 1942, now Patent No. 2,381,550, in that suction chamber 9 is connected into the intake passageway through orifice 12 which is located in the intake passageway opposite or in the same plane or in the area restricted by throttle shaft 5 so that throttle shaft 5 cooperates with the walls of the intake passageway to effect a Venturi action. This Venturi action sets up a vacuum at orifice l2 which is imposed upon diaphragm II and starts the governor valve 4 to close from a wide open position. Governor valve 4 preferably is unbalanced so that the suction on the engine side of the valve tends to open the valve. In other words, the area of that portion of valve 4 below the throttle shaft 5, as shown in the drawing, is slightly greater than the area of I the portion of the valve positioned above shaft 5.

Operation..Tension spring 6 tends at all times to open valve 4. As shown, governor valve 4 'is wide open and suction chamber 9 is being air bled through conduit l5, passageway", I8, 25, and orifices 28 and 29. As soon as the engine reaches its governed speed, centrifugally unbalanced valve 26 will momentarily close, due to centrifugal action, and the air bleeding of suction device 9 and orifice l2 will cease whereupon a vacuum will be created in suction device 8 due to the Venturi action created by shaft 5 restricting passageway I at orifice I2 and the governor valve will move toward closed position to throttle the engine in accordance withthe load and to maintain the governed speed. As the suction device 8 moves valve 4 toward closed position it is opposed by fice l2 opposite shaft 5, the Venturi action at orifice l2, caused by shaft 5 as the engine reaches its governed speed, creates a vacuum in suction device 8 which causes valve 4 to move toward closed position and thereby prevents the engine from overrunning its governed speed.

This application is a division of my application Serial No. 580,450, filed March 1, 1945.

I claim:

1. A governor for an internal combustion engine having an intake passageway comprising a governor throttle valve for controlling the flow of motive fluid through said passageway, a valve shaft for said governor throttle valve extending across said intake passageway, an orifice in the intake passageway positioned in the portion of the intake passageway which is restricted by said throttle valve shaft, a suction actuated device connected into said orifice and operatively connected to said governor throttle valve for imparting movement thereto, an air bleed for said suction device, a valve centrifugally controlled in accordance with engine speed for controlling said.

air bleed, said centrifugal valve closing at a pre-A' determinedengine speed whereby said suction'def; 7 vice moves said governor throttle valve toward [-4 closed position.

anced so that the suction in the intake passage-' way on the engine side of said governor throttle valve tends to open said governor throttle valve in opposition to the suction device which moves said governor throttle valve toward closed positionwhen the centrifugal valve tends to close said air bleed whereby the governor throttle valve is keptfro-m plastering shut.

3. A governor for an internal combustion engine having an intake passageway comprising a governor throttle valve .ior controlling the flow of motive fluid through said passageway, a valve shaft for said governor throttle valve extending across said intake passageway, an orificepositioned in said intake passageway substantially in the plane of said throttle valve shaft which plane extends substantially perpendicular to the longitudinal axis of the intake passageway, a suction actuated device connected into said orifice and operatively connected to said governor throttle valve for imparting movement thereto, an air bleed for said suction device, a valve centrifugally controlled in accordance with engine speed for controlling said air bleed, said centrifugal valve closing at a predetermined engine speedwhereby said suction device moves said governor throttle valve toward closed position.

4. In an internal combustion engine having an intake passageway, a governor valve for controlling the flow of fluid through said passageway, a suction operated device connected to said governor valve, a shaft upon which said governor valve is mounted and located in said intake passageway, an orifice in the wall of the intake passageway substantially in the plane of said valve shaft in the area of said intake passageway restricted by said throttle valve shaft, a conduit connecting the suction device into said orifice, I

a valve housing rotated in accordance with the speed of the engine and having an air bleed port, a second conduit connecting the suction device with said valve housing, said first and second conduits being in communication with each other, and a centrifugally unbalanced valve mounted in said housing for radial movement toward and away from the axis of rotation of said housing and tending to close said port to atmosphere whenever the engine attains a predetermined speed whereby the suction device responds to move said governor valve toward closed position,

and resilient means tending to hold said valve open in opposition to the centrifugal force tending to close the valve, the said valve being arranged in said housin so that it tends to close said port in opposition to atmospheric pressure.

5. The combination as set forth in claim 4 wherein the governor valve is unbalanced so that the suction in the intake passageway on the engine side of the governor valve tends to open said governor valve.

MARION MALLORY.

REFERENCES CITED The following references are of record in the Name Date Mallory Aug. '7, 1945 Number 

